Add prospective-parachain subsystem to minimal-relay-node + QoL improvements (#2223)

This PR contains some fixes and cleanups for parachain nodes:

1. When using async backing, node no longer complains about being unable
to reach the prospective-parachain subsystem.
2. Parachain warp sync now informs users that the finalized para block
has been retrieved.
```
2023-11-08 13:24:42 [Parachain] 🎉 Received finalized parachain header #5747719 (0xa0aa…674b) from the relay chain.
```
3. When a user supplied an invalid `--relay-chain-rpc-url`, we were
crashing with a very verbose message. Removed the `expect` and improved
the error message.
```
2023-11-08 13:57:56 [Parachain] No valid RPC url found. Stopping RPC worker.
2023-11-08 13:57:56 [Parachain] Essential task `relay-chain-rpc-worker` failed. Shutting down service.
Error: Service(Application(WorkerCommunicationError("RPC worker channel closed. This can hint and connectivity issues with the supplied RPC endpoints. Message: oneshot canceled")))
```

cumulus/client/relay-chain-rpc-interface/src/rpc_client.rs

@@ -201,7 +201,7 @@ impl RelayChainRpcClient {
 
 		let value = rx.await.map_err(|err| {
 			RelayChainError::WorkerCommunicationError(format!(
-				"Unexpected channel close on RPC worker side: {}",
+				"RPC worker channel closed. This can hint and connectivity issues with the supplied RPC endpoints. Message: {}",
 				err
 			))
 		})??;